improved phpdoc command
phpdoc formatting issues
fixed all the PHPdoc in extensions
Merge branch 'master' of github.com:yiisoft/yii2

* 'master' of github.com:yiisoft/yii2:
  Refactored filter error display for GridView.
  Fixes #3008: Added `Html::errorSummary()`
phpdoc

[ci skip]